Lock.



H. G. VOIGHT.

LOCK.

APPLICATION FILED APR-4. 19:1.

Patented Feb. 26, 1918.

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HENRY G. VOIGHT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR T0 SARGENT 86 ('JOlllG' PANY, or new HAVEN, oon-nno'rrour, A oonronarron or oonnncrrour.

LOCK.

night latch mechanism or stopwork access sible at the face plateof the lock case for dogging and releasing the outer knob.

Ordinary'locks of this kind have the dis advantagethat the door can be opened by a burglar if he can insert a wire,buttonhook,

or the like, between the face plate and the door jainb and manipulate it in such a manner as to push in the releasing slide or button of the stopwork. Under these conditions the stopwork can be thrown offand the door canthen be opened merely by turning the outside knob. v

The primary object of the present nvention is to furnish an improved form of lock 7 in which the stopwork for dogging thelatch rollback is well protected against unauthorized manipulation of the kind abovementioned. i I U Another object of the invention is 'to .pro{ vide a simple, inexpensivestopwork construction in which access "to the releasing slide or button is rendered very difficult when'the'door is closed and wherein even if such access be had the releasing slide cannot p be so fully actuated as to throw off the dog ging slide and thereby release the outer knob. r e t To these and other ends the invention consistsin the novel features and combinations of parts to be h reinafter' described and claimed.

In the accompanying drawing, Figure 1 is an elevation of a mortise lock embodying my improvements with the cap plate removed, showing thestopwork on and the door closed.

I Fig. 2 is a reverse View of the lower part of Fig. 1 with the stopwork on, the door being'in the open position.

. Fig. 3 is a detail of part of the. stopwork;

Fig. 4 is a transverse section through the Specification of Letters Patent. Patented Fqgb, 26, 1918,; Application filed. Annie, 1917. Serial no. 159,697.

strike plate taken on the line 4-4 of Fig. 1

showing also a portion of the cooperating lock in full lines.

The lock selected for illustration is of the usual mortise type having a case 5 with a face plate or front 6 and the ordinary latchbolt 7 is adapted to be retracted independently by'inner and outer hubs 8, .9, respectively, connected in the customary way with the usual knobs and spindles.

The outer hub 9 has a notch 10, adapted to receive the inner end of a dogging slide 11,

mounted in the lower part of the case between lugs 12 and having an operating head or button 13 projecting out of the case through an opening in the face plate, in the usual manner. This slide 11 forms a part of the stopwork and the latter also includes a releasing slide 14 and a walking beam or connecting lever 15. The walking beam .15

is pivoted to the case at 16 and has a slotted lower end fitting over a pin 17 .on the dog ging slide 11, as customary in looks of this type, so that by pressing in the upper end of the walking beam, bymeans of the releasing slide 14, the dogging slide may beshifted from its operative to its inoperative position.

The cooperation between the releasing slide and the walking beam is an important feature of my invention. In the form shown the upper end of the walking beam is cut away toward the'face ofthe lockcas'e, as shown at 17 so as to form a recess in which the rear extremity of the slide 14 is adapted to enter. The rear extremity of the slide 14 is indicated at 14 and it is adapted to slide on the rear wall ofthe case into and out of the recess 17. On the portion 14 a pin 18 is mounted, over which is fitted the perforated upper'end of a small lever 19, the lower-extremity-of which is permanently pivoted at 20 to the front face of lever 15 and above the pivot 16. The springs 21 fixed to the lever 19 reacts against a lug 22, on the upper end portion of lever 15, and this spring tends to move lever 19 in a counterclockwise direc-, tion with respectto Fig. 1, thereby protracting the head of the releasing slide out of its opening in the face plate as shown in Fig. 1. The outward movement of the releasing slide is'limited by ashoulder 23 at the base parts are in the'position shown in Fig. 1 the head 24, which is preferably rounded off at itsouter end, extends:forwa'rdflfrom the tace strike plate 26 is provided opposite the I socket with the ofiset portion 26.

inner face of this offset portion is curved to form an arc-l ke st r-face, as shown in Fig. at.

' against which the end of the slide head 2 1 contacts. This curved inner surface with whichthe head 24L contacts forces the slide into its: lock as the door is Opened. The strike'plate 26 is also provided upon its outer edge with a curved portion 26", against which the end of the head 24 strikes when the door is being closed It will therefore be seen that the curved portions 26' and 26 of the strike plate force: the slide head 24L into its lock sufficiently to prevent the slide head of the door.

The operation of thelock is substantially asfollows: 'I-he spring 21 acting on the re leasing slide lt normal'ly holds it in the profrom interferin 'with'the o ienin or closin tracted position regardless of theposition o fthe dogging slidell lVhen the'dogging slide isin the released position, and is pushed into the dogging. position, the upper end of the walking bea1n, and the lever l9,. arev shifted to? a slight extent toward the face.

of the case but without affecting the releasing slide in any way, In order to release the dogging slide again thehead ofthe releasing slide is pushed in by the fingerfor.

. thum -e 8 h vr in Fi 3- By the t me i outer extremity isfiush or nearly flush with the outer face of the lock front no shifting action on the walking bealnhas taken place, the inner end of the releasing slide being merely displaced in the recess 1 of the walk- 7 5'0 i V walking beam WillIbe-thrust rearwardly so fed mg beam-t0. take up the lost motion; However, atalooutthe'timeithat the outer extremity of the head is flush or nearly sovv with the lock front,; the rear extremity of the slide abuts the inner edge of recess l7and then as thesjlide is pushed from the position shown in full lines in Fig. .3, to the position shownin dotted'lines, the upper end Of th as to move the dogging slide to the released position. I 7

When the door is closed the head 24: takes into the recess 25 as shown in Figs. 1 and -l Preferably the head 24L is round and the recess 25} is correspondingly shaped but slightlylarger. The rounding of the head permits. the slide 145 to act in the nature of allatchloolt, being pressed in by the curved portion of the strike as the. door is closed and then shootingout into the opening or recess Theronnding of-the head 24L; not only acts'in'the; nature "of a bevelwhen the door closes but it also facilitates the centering of The the head in the recess 25, as will be understQOd.

The head 24 extends into the recess 25 to such an extent that usually only the cylindrical part of the head will be exposed in the crack of the door. In other words, the rounded portion on the head will be confined within the lines of the strike plate. It has been found that in locks of the character described the releasing slide can be attacked, generally, in only two ways, viz: either by a bent wire or a but-tonhook which is inserted in the craek 0t thedoor and then turned so as to exert pressure on the middle of the head of the releasing button or slide; or by a fiat instrument, like a knife blade, which is moved in the general plane of the crack without any turning or twisting motion. The construction. herein described is very secure for the reason that the head 24- is received in,and partly covered by the strike plate, so that it is impossible tocxert a direct inward push on the head of the releasing slide by turning a buttonhook or bent wire in the crack, as previously deing on the curved or beveled surface thereof,

an'instrument of the latter sort, obviously, cannot press in the head to a point beyond the outer surface of the face plate or front, and this is insuflicient to release the stopwork, as previously pointed out, owing to the lost motion connection between the releasing slide and the connecting lever.

It will be understood therefore, that with my new lock, successful. attack on the stopwork by the customary methods is practi:v cally impossible, and this advantage is oht-ained without complicating the lock constructionto any appreciable extent, or appreciably increasing its cost. fVVithout limiting myself to the precise construction shown, I claim,

1. In a lock, stopwork for dogging the. latch rollback having a part extending into the strike. i

2. In a lock, stopwork for dogging the latch rollback including a releasing slide extending into an opening in the strike 3. In a lock, stopwork including a dog'- ging slide and a releasing slide, one of said slides normally protracted beyond the face of the lock, and a strike having a socket to receive said last named slide.

l. In a lock, a dogging. slide, a releasing slide, a walking beam having a positive connection with one of said slides and a lost motion connection with the other slide, and means normally protracting the slide having the lost motion connection vithsaid walking beam.

5. In a lock, a dogging slide, a releasing r 1,257,554 la slide, a Walking beam having a lost motion connection with the releasing slide, and a sFging tending to protract the releasing s 1 e.

6. In a lock, a dogging slide, a releasing slide, a Walking beam having a lost motion connection with the releasing slide, and a spring tending to protract the releasing slide, said releasing slide having-a head extending out from the face of the lock.,

7. In a look, a dogging slide, a releasing slide, a Walkingbeam having a positive con nection With said dogging slide and-a lost motion connection With said releasing slide,

1 said releasing slide having a round head normally projected beyond the face plate of the lock, and a strike plate having a socket to receive said head when the door is closed. 8. In a look, a dogging slide, a releasing slide, a Walking beam having a lost motion connection with one of said slides, and a spring-pressedlever holding said last named Women of this patent may be obtained for slide in operative relation to said walking beam.

9. In a look, a dogging slide, a releasing slide, a Walking beam having a notch in Which said releasing slide is adapted to move before it shifts the Walking beam, and a spring-pressed lever on the Walking beam pivotally connected With the inner end of said releasing slide.

10. In a look, a stopwork mechanismineluding a Walking beam having a notch therein, a releasing slide having a certain amount of free movement in said notch before it engages and shifts said Walking beam, means for yieldingly protracting the releasing slide beyond the face of the lock, and a strike plate having a recess to receive the. outer end of said releasing slide.

In Witness whereof, I have hereunto set my hand on the 2nd day of April, 1917.

HENRY G. VOIGHT.

five cents each, by addressing the Commissioner of Patents, Washington, D. 03. 4 a 

